Data Description

This page summarizes information about the selected resource and its origin based on SPASE metadata.

Table of Contents

  1. Product
  2. Repository
  3. Instrument
  4. Observatory
  5. Persons

SPASE version 2.0.0

Numerical Data Product: IMP 8 U.Chicago Cosmic Ray and Nuclear Composition (CRNC) 15-min counts

Resource ID
spase://VEPO/NumericalData/IMP8/CRNC/PT15M Get XML
Name
IMP 8 U.Chicago Cosmic Ray and Nuclear Composition (CRNC) 15-min counts
Description

This 15-min-resolution data set consists of 5 count rates from the Low Energy Telescope, 8 count rates for the main telescope (MT), 4 counts of pulse height analyzed events in each of 4 MT coincidence modes, and 27 box counts corresponding to specific species and energy ranges associated with 3 of the MT coincidence modes. Actually the 13 referenced "count rates" are given as paired counts and accumulation times. Associated documentation suggests algorithms for computation of count rates and fluxes from the MT data given, for electrons in 3 energy bands (0.7-2.0, 2.0-12, 12-50 MeV), protons in 9 bands (11.24-20.00 MeV to 74.50-94.78 MeV), helium nuclei in 10 bands (10.90-12.89 MeV per n to 84.32-94.81 MeV per n), and CNO nuclei in 1 band (25 - 250 Mev per n). There are no azimuthally sectored data in this data set. The data are accessible via ftp and, with higher functionality, via FTPBrowser.

Additional information
Voldesc file at nssdcftp

Detailed documentation file about experiment and data

Acknowledgement

C. Lopate, UNH, and the late J. Simpson, U. Chi

Contact
Role Person
1. General contact Dr. Clifford Lopate Get XML
Release date
2008-10-07 17:56:58
Prior ID
spase://VEPO/NumericalData/IMP8/UChi/PT15M
Repository
Name
SPDF Get XML
Availability
Online
Access rights
Open
URL
FTPBrowser

Interface to plot or list parameter subsets

nssdcftp

download files by ftp

Format
Text
File size
320 MB
Acknowledgement

C. Lopate, UNH, the late J. Simpson, U. Chicago, and the NSSDC and SPDF at GSFC

Processing level
Uncalibrated
Instrument
Cosmic Ray Nuclear Composition Get XML
Measurement type
Energetic particles
Temporal description
Start date
1973-10-30 00:00:00
Stop date
2000-09-30 00:00:00
Cadence
15 minutes
Observed regions
Heliosphere.NearEarth
Caveats

Data must be processed to obtain count rates and fluxes. Note that records with no data have spacecraft ID = 0 in first word.

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Parameters

Parameter #1

Name
Coincidence mode counts
Description

A set of 13 counts of events corresponding various telescope coincidence modes and discriminator levels

Cadence
15 minutes
Structure
Size
13
Description

A set of 13 counts of events corresponding various telescope coincidence modes and discriminator levels. Counts are due to a mix of protons and alpha particles identified below plus 0.7-50 MeV electrons.

Particle type
Proton
AlphaParticle
Quantity
Counts
Energy range
Low energy
0.54
High energy
94.78
Units
MeV per n

Parameter #2

Name
Count accumulation durations
Description

A set of 13 accumulation durations (in seconds) corresponding to the 13 coincidence mode counts described above

Cadence
15 minutes
Units
sec
Structure
Size
13
Description

A set of 13 accumulation durations (in seconds) corresponding to the 13 coincidence mode counts described above

Parameter type
Other

Parameter #3

Name
Counts of events pulse height analyzed
Description

A set of 4 counts of events pulse height analyzed in various coincidence modes for this interval for the CPI main telescope

Cadence
15 minutes
Structure
Size
4
Description

A set of 4 counts of events pulse height analyzed in various coincidence modes for this interval. Counts are due to a mix of protons and alpha particles identified below plus 0.7-50 MeV electrons.

Particle type
Proton
AlphaParticle
Quantity
Counts
Energy range
Low energy
11.24
High energy
94.78
Units
MeV per n

Parameter #4

Name
Box counts for specific species
Description

A set of 27 counts in E-dE/dx boxes corresponding to known species and energy ranges. In particular, there are 9 proton counts with energy ranges between 11.24-12.62 MeV and 74.50-94.78 MeV plus 2 proton counts aggregated over subsets of the 9, 10 alpha particle counts with energy ranges between 10.90-12.89 MeV/n and 84.32-94.81 MeV/n plus 2 alpha particle counts aggregated over subsets of the 10, 3 electron boxes at 0.7-2.0 MeV, 2.0-12 MeV, and 12-50 MeV, and one CNO box at ~25-250 MeV/n

Caveats

Data and companion documentation (algorithms, geometric factors, etc.) enable calculation of count rates and fluxes

Cadence
15 minutes
Structure
Size
27
Description

A set of 27 box counts as described above

Particle type
Proton
AlphaParticle
Quantity
Counts
Energy range
Low energy
11.24
High energy
94.78
Units
MeV per n
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SPASE version 2.0.0

Instrument: Cosmic Ray Nuclear Composition

Instrument ID
spase://SMWG/Instrument/IMP8/CRNC Get XML
Name
Cosmic Ray Nuclear Composition
Description

This experiment used two telescopes to measure the composition and energy spectra of solar (and galactic) particles above about 0.5 MeV/nucleon. The main telescope consisted of five collinear elements (three solid state, one CsI, and one sapphire Cerenkov) surrounded by a plastic anticoincidence shield. The telescope had a 60-deg, full-angle acceptance cone with its axis approximately normal to the spacecraft spin axis, permitting eight-sectored information on particle arrival direction. Four elements of the main telescope were pulse-height analyzed, and low- and high-gain modes could be selected by command to permit resolution of the elements H through Ni or of electrons and the isotopes of H and He and light nuclei. A selection-priority scheme was included to permit sampling of less abundant particle species under normal and solar-flare conditions. The low-energy telescope was essentially a two-element shielded solid-state detector with a 70-deg full-angle acceptance cone. The first element was pulse-height analyzed, and data were recorded by sectors.

Additional information
NSSDC's Master Catalog

Information about the Cosmic Ray Nuclear Composition experiment on the IMP-J mission.

Contact
Role Person
1. Principal investigator Dr. Clifford Lopate Get XML
Release date
2009-05-20 21:10:02
Instrument type
Energetic Particle Instrument
Investigation name
Cosmic Ray Nuclear Composition on IMP-J
Observatory
IMP 8 Get XML
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SPASE version 2.0.0

Observatory: IMP 8

Observatory ID
spase://SMWG/Observatory/IMP8 Get XML
Name
IMP 8
Alternate name
IMP-J
Explorer 50
1973-078A
Description

IMP 8 (IMP-J or Explorer 50), the last satellite of the IMP series, was a drum-shaped spacecraft, 135.6 cm across and 157.4 cm high, instrumented for interplanetary and magnetotail studies of cosmic rays, energetic solar particles, plasma, and electric and magnetic fields. Its initial orbit was more elliptical than intended, with apogee and perigee distances of about 45 and 25 earth radii. Its eccentricity decreased after launch. Its orbital inclination varied between 0 deg and about 55 deg with a periodicity of several years. The spacecraft spin axis was normal to the ecliptic plane, and the spin rate was 23 rpm. The data telemetry rate was 1600 bps.

The spacecraft was in the solar wind for 7 to 8 days of every 12.5 day orbit. Telemetry coverage was 90% in the early years, but only 60-70% through most of the 1980's and early 1990's. Coverage returned to the 90% range in the mid to late 1990's.

The objectives of the extended IMP-8 operations were to provide solar wind parameters as input for magnetospheric studies and as a 1-AU baseline for deep space studies, and to continue solar cycle variation studies with a single set of well-calibrated and understood instruments.

In October, 2001, IMP 8 was terminated as an independent mission. Telemetry acquisition resumed after about three months at Canberra only (30-50% coverage), as an adjunct to the Voyager and Ulysses missions. As of August 2005 IMP 8 continued in this mode.

Additional information
IMP-8 Project Information
NSSDC's Master Catalog

Information about the IMP-J mission

Contact
Role Person
1. Project scientist Dr. Robert E. McGuire Get XML
Release date
2009-05-20 20:00:12
Prior ID
spase://vspo/observatory/63
Observatory group
IMP
Location
Region
Earth.Magnetosheath
Earth.Magnetosphere.Magnetotail
Heliosphere.NearEarth
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SPASE version 2.0.0

Person: Dr. Clifford Lopate

Name
Dr. Clifford Lopate
Organization
University of New Hampshire
Person ID
spase://SMWG/Person/Clifford.Lopate Get XML
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SPASE version 2.0.0

Person: Ms. Tamara J. Kovalick

Name
Ms. Tamara J. Kovalick
Organization
GSFC-Code 672
Email
Tamara.J.Kovalick@nasa.gov
Phone
+1-301-286-9422
Person ID
spase://SMWG/Person/Tamara.J.Kovalick Get XML
Release date
2008-03-19 00:00:00
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SPASE version 2.0.0

Person: Mr. Robert M. Candey

Name
Mr. Robert M. Candey
Organization
NASA Goddard Space Flight Center
Address
Code 672, Greenbelt, MD 20771, USA
Email
robert.m.candey@nasa.gov
Phone
1-301-286-6707
Person ID
spase://SMWG/Person/Robert.M.Candey Get XML
Release date
2007-05-30 19:43:56
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SPASE version 2.0.0

Person: Dr. Robert E. McGuire

Name
Dr. Robert E. McGuire
Organization
NASA Goddard Space Flight Center
Address
Code 672, Greenbelt, MD 20771, USA
Email
mcguire@mail630.gsfc.nasa.gov
Phone
1-301-286-7794
Person ID
spase://SMWG/Person/Robert.E.McGuire Get XML
Release date
2007-05-30 15:25:24
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SPASE version 1.3.0

Repository: SPDF

Repository ID
spase://SMWG/Repository/NASA/GSFC/SPDF Get XML
Name
SPDF
Description

Space Physics Data Facility

Additional information
SPDF

Space Physics Data Facility

Contact
Role Person
1. General contact Ms. Tamara J. Kovalick Get XML
2. Technical contact Mr. Robert M. Candey Get XML
3. Project scientist Dr. Robert E. McGuire Get XML
Release date
2008-08-26 21:02:30
Prior IDs
spase://vspo/repository/61
spase://SMWG/Repository/SPDF
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